Mixed feelings on that one. The ruling classes have at times set it up so that few of the "lower class" could ever become property owners. But it should relate to taxes; all should participate to earn their share in the state.
I have an even simpler idea - restrict the vote to those who have served in the military or civil service for a term of time and left under honorable terms. One hitch in the military or 20 years civil service.
Heinlein had the right idea; the vote should only be given to those who have proved that they are willing to put the good of others above their own interests.